642349145 has 4 divisors (see below), whose sum is σ = 770818980. Its totient is φ = 513879312.

The previous prime is 642349139. The next prime is 642349187. The reversal of 642349145 is 541943246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 359974729 + 282374416 = 18973^2 + 16804^2 .

It is a cyclic number.

It is not a de Polignac number, because 642349145 - 2¹⁰ = 642348121 is a prime.

It is a super-4 number, since 4×642349145⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 642349099 and 642349108.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64234910 + ... + 64234919.

It is an arithmetic number, because the mean of its divisors is an integer number (192704745).

Almost surely, 2^642349145 is an apocalyptic number.

It is an amenable number.

642349145 is a deficient number, since it is larger than the sum of its proper divisors (128469835).

642349145 is a wasteful number, since it uses less digits than its factorization.

642349145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128469834.

The product of its digits is 103680, while the sum is 38.

The square root of 642349145 is about 25344.6078091574. The cubic root of 642349145 is about 862.8269801335.

The spelling of 642349145 in words is "six hundred forty-two million, three hundred forty-nine thousand, one hundred forty-five".